Do you ever get an idea and it won't leave you alone when you're away from your writing implement (be it keyboard or pen/pencil)? That's a writer's joy because the words flow out almost seamlessly.
What about when you love your story idea, but the words won't flow? Does this happen to you? Would you consider it a semi-writer's block?
What if (oh no) you've fallen out of love with your story idea, but people (like your agent or an editor) are expecting you to finish it? Has that ever happened to you?
I've experienced two of the three above, and even sorta the last one - although it was with a manuscript that I'd already finished, but needing tweaking.
I've never thought of myself as fickle; but I guess it does happen. One day I love the idea I'm working on, then the next day, not so much.
My advice to myself is (especially if it's the last situation) - keep on writing. Isn't that what all the "pros" in the writing industry say to do? If we don't sit our tushies down and write, the story will never get finished.
If I find myself in either #2 or #3, I might create a new playlist, devise new characteristics for my characters, or change the setting. I try to let the words flow where ever they may go, and I don't allow my own "ideas" to get in the way.
What are your writing strategies when you're stuck?